Mac Studio M3 Ultra 512GB: 512GB VRAM — What Local LLMs Can It Run?
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The Mac Studio M3 Ultra 512GB has 512GB of LPDDR5X memory with 819 GB/s of bandwidth. No used-price data yet. At Q4 quantization it runs models up to 70B parameters at roughly 11 tokens/s.
Full Mac Studio M3 Ultra 512GB specifications
What LLMs can the Mac Studio M3 Ultra 512GB run?
One reference model per family (its main version)| Model | Q4_K_M | Q8_0 | FP16 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Fits | Speed t/s | Context | Fits | Speed t/s | Context | Fits | Speed t/s | Context | |
| DeepSeekDeepSeek R1 Qwen3 8B | ✓ | 80.6 | 128K | ✓ | 46.9 | 128K | ✓ | 26 | 128K |
| GemmaGemma 4 31B | ✓ | 20.5 | 128K | ✓ | 12.1 | 128K | ✓ | 6.8 | 128K |
| GLMGLM 4.7 Flash | ✓ | 121.1 | 128K | ✓ | 86.8 | 128K | ✓ | 56.2 | 128K |
| gpt-ossgpt-oss 20B | ✓ | 111.5 | 128K | ✓ | 77.6 | 128K | ✓ | 49 | 128K |
| KimiKimi Linear 48B A3B | ✓ | 127.2 | 128K | ✓ | 89.9 | 128K | ✓ | 57.5 | 128K |
| LlamaLlama 3.1 8B | ✓ | 82.8 | 128K | ✓ | 48.1 | 128K | ✓ | 26.6 | 128K |
| MistralMistral 7B v0.3 | ✓ | 90.2 | 32K | ✓ | 52.7 | 32K | ✓ | 29.3 | 32K |
| QwenQwen3 8B | ✓ | 80.6 | 32K | ✓ | 46.9 | 32K | ✓ | 26 | 32K |
Fits when weights + KV cache + runtime overhead is at or below usable memory, single card. "Offload" on MoE models means it runs with expert weights in system RAM (only attention layers and KV cache stay in VRAM); that speed assumes 70 GB/s RAM bandwidth. The context column is the largest tier that fits.
Mac Studio M3 Ultra 512GB used price history
Not enough history to draw a chart yet — price tracking just started.
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FAQ
How much VRAM does the Mac Studio M3 Ultra 512GB have?
The Mac Studio M3 Ultra 512GB has 512GB of LPDDR5X memory with 819 GB/s of bandwidth.
Can the Mac Studio M3 Ultra 512GB run a 70B model?
Yes. At Q4_K_M with an 8K context a 70B dense model needs about 43GB, which fits in the Mac Studio M3 Ultra 512GB's 512GB.
How much does a used Mac Studio M3 Ultra 512GB cost?
No used-price data yet; it will appear here once the feed is live.